Arcgis for Server - Activation code

Hi guys. I'm trying to install ArcGis for Server 10.3.1 with an activation code for 10.5 version but it doesn't work. Is there any problem using this activation code for a prior version of Arcgis for Server?

10.5 does have a different code than 10.0-10.4, so you will not be able to use the same code. If you have been on maintenance for a while (pre 10.5), you should be able to go to you myesri page to get that license instead of the 10.5, assuming you only have one license.

if this is a new purchase since 10.5 was released, you may need to talk to your customer service rep or local distributor to see if you can use previous version. I am not sure how the licensing works in that case, but they may be able to help.